Subband-specific codebook subset restriction

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a first configuration of one or more channel state information reference signal resources and a second configuration of a channel state information report associated with the one or more channel state information reference signal resources. In some cases, the second configuration may include at least one of an indication of a codebook, a set of codebook restriction sets, and a configured bandwidth. The UE may then identify a mapping between one or more frequency-domain subbands of the configured bandwidth and each codebook restriction set of the set of codebook restriction sets, and transmit, to the base station, a report indicating one or more precoding matrix indicators from the codebook for each of the one or more frequency-domain subbands based on the mapping.

What is claimed is: 
     
         1 . An apparatus for wireless communication, comprising:
 a processor; and   memory coupled with the processor, wherein the processor is configured to:
 receive a first configuration of one or more channel state information reference signal resources; 
 receive a second configuration of a channel state information report associated with the one or more channel state information reference signal resources, the second configuration comprising at least one of an indication of a codebook, a plurality of codebook restriction sets, and a configured bandwidth; 
 identify a mapping between one or more frequency-domain subbands of the configured bandwidth and each codebook restriction set of the plurality of codebook restriction sets; and 
 transmit a report indicating one or more precoding matrix indicators from the codebook for each of the one or more frequency-domain subbands based at least in part on the mapping. 
   
     
     
         2 . The apparatus of  claim 1 , wherein the processor is configured to:
 identify, based at least in part on a configuration of a time period for downlink transmissions, an uplink portion within the time period and a downlink portion within the time period, wherein the mapping is based at least in part on the uplink portion and the downlink portion.   
     
     
         3 . The apparatus of  claim 2 , wherein the uplink portion comprises an uplink bandwidth part and the downlink portion comprises a downlink bandwidth part. 
     
     
         4 . The apparatus of  claim 2 , wherein the uplink portion and the downlink portion are concurrently included in a same component carrier and a same symbol. 
     
     
         5 . The apparatus of  claim 1 , wherein the processor is configured to:
 identify, based at least in part on a configuration of a time period for downlink transmissions, a first set of physical resource blocks associated with an uplink portion;   identify, based at least in part on the configuration of the time period, a second set of physical resource blocks associated with a downlink portion; and   determine a boundary between the uplink portion and the downlink portion, wherein the mapping is based at least in part on the boundary.   
     
     
         6 . The apparatus of  claim 5 , wherein the first set of physical resource blocks and the second set of physical resource blocks are associated with a component carrier. 
     
     
         7 . The apparatus of  claim 1 , wherein the processor is configured to:
 identify, based at least in part on a configuration of a time period for downlink transmissions, a guard band within the time period; and   determine a threshold number of physical resource blocks from the guard band within the time period, wherein identifying the mapping is based at least in part on the identifying the guard band.   
     
     
         8 . The apparatus of  claim 1 , wherein the processor is configured to:
 identify a plurality of frequency-domain subbands associated with a downlink bandwidth part, wherein identifying the mapping is based at least in part on identifying the plurality of frequency-domain subbands.   
     
     
         9 . The apparatus of  claim 8 , wherein, to identify the mapping, the processor is configured to:
 identify the mapping between a codebook restriction set with each frequency-domain subband of the plurality of frequency-domain subbands based at least in part on identifying the plurality of frequency-domain subbands.   
     
     
         10 . The apparatus of  claim 8 , wherein, to identify the mapping, the processor is configured to:
 identify the mapping between a first codebook restriction set and a first set of frequency-domain subbands of the plurality of frequency-domain subbands; and   identify the mapping between a second codebook restriction set and a remaining set of frequency-domain subbands of the plurality of frequency-domain subbands.   
     
     
         11 . The apparatus of  claim 1 , wherein the processor is configured to:
 receive a control message; and   identify the plurality of codebook restriction sets associated with the codebook based at least in part on the control message.   
     
     
         12 . The apparatus of  claim 11 , wherein the processor is configured to:
 identify one or more bits included in the control message; and   identify the mapping between the one or more frequency-domain subbands of the configured bandwidth and each codebook restriction set based at least in part on identifying the one or more bits.   
     
     
         13 . The apparatus of  claim 11 , wherein the control message comprises at least one of downlink control information, a media access control (MAC) control element, or a combination thereof. 
     
     
         14 . The apparatus of  claim 1 , wherein the processor is configured to:
 receive a control message; and   update the mapping between the one or more frequency-domain subbands of the configured bandwidth and each codebook restriction set based at least in part on the control message.   
     
     
         15 . The apparatus of  claim 1 , wherein the processor is configured to:
 transmit a capability message indicating a capability of the apparatus to support the plurality of codebook restriction sets, wherein the mapping is based at least in part on the capability message.   
     
     
         16 . The apparatus of  claim 1 , wherein the plurality of codebook restriction sets are associated with at least one of a single panel codebook, a multi-panel codebook, or a combination thereof. 
     
     
         17 . The apparatus of  claim 1 , wherein the report is associated with full-duplex communication. 
     
     
         18 . The apparatus of  claim 1 , wherein the one or more frequency-domain subbands of the configured bandwidth are contiguous. 
     
     
         19 . The apparatus of  claim 1 , wherein the one or more frequency-domain subbands of the configured bandwidth are non-contiguous. 
     
     
         20 . An apparatus for wireless communication, comprising:
 a processor; and   memory coupled with the processor, wherein the processor is configured to:
 transmit a first configuration of one or more channel state information reference signal resources; 
 transmit a second configuration of a channel state information report associated with the one or more channel state information reference signal resources, the second configuration comprising at least one of an indication of a codebook, a plurality of codebook restriction sets, and a configured bandwidth; 
 identify a mapping between one or more frequency-domain subbands of the configured bandwidth and each codebook restriction set of the plurality of codebook restriction sets; and 
 receive a report indicating one or more precoding matrix indicators from the codebook for each of the one or more frequency-domain subbands based at least in part on the mapping.